Sewing-machine



(No Model.) 3 Sheet-,s-Sheei:l 1.

H C PETERS SEWING MACHINE.

.Patented June 25, 1895.

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SEWING MACHINE. I No. 541,570. Patented June 25, 1895.

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recom-nonsens Mi eases H. C. PETERS.

SEWING MAGHINB.

3 Sheets-Sheet 3.

(N o Model.)

No. 541,570. Patented June 25, 1895.

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NTTED STATES PATENT OFFICE.

HEBER C. PETERS, OF BOSTON, MASSACHUSETTS.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 541,570, dated J une25, 1895. Application tiled January 23, 1895: Serial No. 535,871. A(ll'omodel.)

T all whom, it may concern:

Be it known that I, HEBER C. PETERS, a citizen ot' the United States,residing at Boston, in the county of Suffolk and State of Massachusetts,have invented certain new and useful Improvements in Sewing-Machines, ofwhich the following is a specication, reference being had therein to theaccompanying drawings.

My invention relates to sewing machines which are used for sewingleather, and more particularly to the devices which are employed in suchmachines for actuating the cast-oft and thread-guide, and also to theconstruction of the thread guide. v

The invention will be fully described first in connection with theaccompanying drawings, after which the respective features thereof willbe more particularly pointed out and clearly defined in the claims atthe close ofy this specification. l

In the drawings, Figure 1 is a view in side elevation of asewing-machine having my invention applied thereto.

Fig. 2 is a view of the said sewing-machine in end elevation, the

view being taken from the right h-and in Fig.-

1. Figs. 3, 4, and 5 are detail-views showing certain features of theoperating mechan- Iism. Figs. 6 and 7 show a modification.

1 is the frame-work of the machine.

2 is the work-supporting post, it having the throat-plate 3 mountedthereon at its' upper end.

4 is the driving shaft, shown as provided with a band pulley 5. Anysuitable and desired driving arrangements may be employed.

6 is the needle, 7 is the'needle-bar, and 8 is the needle-post, the saidneedle-post having guides in which the needle-bar moves u p and down asusual. The said needle-post is afxed to the projecting front end of therocker-shaft 9.

10 is a pivot connecting to the needle-bar 7 the upper end of the link11, the lower end of said link being connected by the pivot l2 to thearm.13 of the rocker-shaft 14.

is the cast-'oftfand 1 6 is the cast-oft bar, the said bar moving up anddown in guides in the needle-post 8.

17 is the awl, and 18 is the awl-bar, the said aWl-bar moving up anddown in guides in the head 19, as usual, and being actuated by means ofthe arm 20 on the rocker-shaft 2l.

22 is the presser-foot, and'23 is the presserbar, the latter beingmounted in guides in the said head 19.

All of the foregoing parts are or maybe of usual character andconstruction.

1 24 is a disk or plate mounted upon the inner end of the driving shat't4, and carrying a compound or double crank pin 25 substantially such asis presented in United States Letters Patent No. 530,471. See Figs. 1and 3. The main portion of the said crank-pin has applied thereto theeye 26 at the lower end of the connecting-rod 27, the latter having atits upper end a pivotal connection at 28With the arm 29 ot' therocker-shaft 21. Through these devices and connections the awl-barrocker-shaft 2l is operated.

30is the offset portion of the crank-pin, from which the needle-barrocker-shaft 14 is actuated. The said off-set portion 30 receives uponit the eye 3l, at the upper end of the connecting rod 32, which latterhas at its lower end an eye 33 that is fitted to the pivotal bolt 34servingy to connect it with the arm-35 on the needle-barrocker-shaftlet.' The bolt 34 is set in a slot 36 which isformed in thearm 35, and is secured in the desired position lengthwise of the saidslot by means of the nut 37. The adjustment of the bolt 34 along theslot 36 varies the length of the stroke which is transmitted through thearm 35, rocker-shaft 14, arni 13,-and link 11, to the needle-bar 7 andneedle 6.Y The slot 36 is curved, and when the arm 35 has been raisedinto its highest position the said slot36 corresponds with the arc ot' acircle that is concentric with the portion 30 of the compound or doublecrank 25. As a result of this arrangement of the slot with reference tothe portion 30 ot` the double or compound crank, the adjustment ofthebolt 34 along the slot 36 has no eect in varying the point which isreached in each rise of the needle, the highest point of the movement'of the needle being the same for all adjustments. The latter have merelythe effect of varying the extent to Which the needle is depressed.

38 (see more particularly Fig. 4) is a cam fixed upon the shaft 4.

39 is a bar in engagement with the said cam and having one end thereofconnected by a bolt 40 with an arm 41 on the cast-otf'rockershaft 42.

43 is a second arm on the said rocker-shaft, it having connected to itby pivotal screw 44 the upper end of the link 45, which latter has itslower end connected by the pivotal, screw 4G with the block 47, the saidblock being made fast to the castoff bar 16,-by means. of the screw 48,or in other suitable manner.

The foregoing devices serve for the actuation of the cast-off bar andcast-oft'.

49 is a slot in the arm 41, along which the pivotal bolt 40 maybeadjusted, in order to vary the length of the stroke that iscomin-unicated to the cast-olf bar and cast-off. TheA the opposite endsof the arc381, as centers.

A change in the length of stroke of the needle-bar and needle should beaccompaniedin most cases, particularly if such change alters the stroketo any desirable extent, by a corresponding change in the stroke of thecastolf bar and cast-off. The slot 4.9 enables the stroke of thecast-off bar and cast-off to be,

changed. w l

I have found by practical. experience that the best results are securedil", when the stroke,

of the needle bar is varied,.and. in addition to correspondingly Varyingthe length of the stroke of the cast-off bara variation be occasioned inthe timing ot the stroke. of the cast-olf bar and cast-off relatively tothat ot'. L the needle-bar and needle, by beginning the.

downstroke of the cast-ott at an earlier instant in the down-stroke ofthe needle.

It is evident that after a change in the length of stroke in theneedlebar and needle,

such downward movement must be begun and` completed within the sametimelimits asbefore the change was made. From this it re-` sults thatthe needle-bar and needle are compelled to travel much more rapidlywhile making a long stroke than while makinga short one.`

Asis well understood by those familiar with machines of theY classwhichincludes that illustrated in` the drawings, the downward movement of thecast-o does not begin until after a part of the downwardk movement of`the needle has been made, the cast-0E then starting and accompanying theneedle while thellatter continues to descend. If the machine is soconstructed and adjusted that, when the needle-bar and needle areworking with a short stroke, the` cast olf will begin to descend atpractically the same rate of speed as that at which the needle ismoving, we shall find, after making an increase in the length of strokeof the needle, that the needle will descend more rapidly than thecast-olf, when the latter begins its down-stroke. In consequence, therewill be a considerable change of relative position between the two,which is undesirable, inasmuch as it tends to Y cause the thread to becrowdedinto the hook of the needle and pinched therein.

I remedy the foregoing defects and disadvantages by mounting the arm 4lon the rocker-shaft 42, in a downwardly inclined pol sition, as shown,and I employ the construction of bar 39 and cam 38 above described.When, now, the bo1t40is adjusted outwardly I along the arm 41,`inlengthening the stroke of the cast-olf, it occasions, as will beapparent, t an angular adjustment of the bar 39 with reff erence totheshaft 4-that is to say, in inaknling this adjustment of the bolt 40outwardly .l along the arm 41 of the rockenshaft 42, the

vvbar 39 is swung through a small number of .j degrees around the shaft4. The direction of `rotation of the shaft 4 is as represented by 1`the` arrow in Fig. 4. lt results from this that the downward movementoccasioned by the t portion` 384 of the cam 38 begins at an earlier wmoment in the order of the movement of the parts of the mechanism. In`other words, the angular adjustment of the bar 39, quickens, as. it istermed, the action of the cam 38 in the timing of the parts. Inconsequence ot' being started earlier with` relation to the timl ing ofthe descending movement of the needle, the movement of the cast offalready has become somewhat accelerated by the time `that the hook ofthe needle has descended to vthe point of the cast-off,` and hence thetwo continue to descend more nearly in perfect unison than otherwisewould be possible.

50 is another cam mounted to the shaft 4 and rotating within an openingor yokein the arm 5l. From the said arm 51, the needle- 4 postrocker-shaft 9 is actuated. For this purpose, I make` use, by preferenceof the mechl anism which is presented in Letters Patent of the UnitedStates No. 507,786, to which reference may behad. The upper end of thearm 51, see` Figs. 1 and 5, carries a pivotal screw 52, 1 'whichreceives the eye 53 of the link 54. The other end of the said link hasan eye 55 titting the pivotal bolt 56 which is set in the slot 57 of thearm 58, the latter being sleeved upon thethreadfguide rocker-shaft 59.`The said4 thread-guide-rocker shaft 59 is mounted in bearings at 60, 61in which it is arranged t to rock and to slide endwise. Adjustment ot' 1the bolt 56 in the slot 57 enables the length of the movementtransmitted to rocker-shaft 59 to be varied. The end of the rocker-shaftl 591 which receives the arm 58 has, formed 9 therein a groove orgrooves 62, into which is @received a key or keys 63 to cause the armand rocker-shaft to turn in unison while perl mitting the rocker-shaftto move lengthwise ITO ' rocker-shaft 59, and 68 is a spiral springsurrounding the said rocker-shaft and located between the collar 66 andthe part of the Inachine which contains the bearing 6l. The spring andcam act in opposition to each other in producing the longitudinalmovements of the rocker-shaft 59.

The forward end of the rocker-shaft 59 is bored transversely to receivethe cylindrical pin 69, which latter is held therein by the clampingscrew 70. The block 7l applied to the pin 69 is bored at right angles tothe bore of the rocker-shaft, and receives the cylindrical stem of thethread-guide 72, which is held in place by the clamping screw 73. Thepin 69 may be adjusted in the direction of its length relatively to therocker-shaft, and may be turned on its longitudinal axis. In likemanner, the thread-guidevmay be adjusted longitudinally7 in the block7l, and may be rocked upon its axis.

A modified means of connecting the arm 58 and the rocker-shaft 59 so asto compel them to turn in unison about the axis of the said rocker shaftbut with capacity for permitting movement of the said rocker-shaft inthe direction of its length is shown in Figs. 6 and 7. In these iigures,the outer end of the rockershaft is squared off and to the same is tteda bushing 74. This bushing is slotted lengthwise thereof from theperiphery to and beyond the center. A gib fitted to the said slots iillsthat portion thereof which is not occupied by the squared portion of theshaft. This gib is somewhat longer than the distance from the outer sideof one of the ears '76 to the outer side of the other of said ears 76,and the 11p-turned ends 751, 751, of the said gib 75 are at the outerside of the said ears 76, 76. Thereby the gib is prevented from movingendwise with the shaft as the latter reciprocates. The hub or sleeve ofthe arm 58 is fitted to the exterior of the bushing 74 between the ears76, which also in the case of the construction which is represented inFigs. l and 5, hold the said arm from movement in the direction of thelength of the rocker-shaft 59. Through the side of the sleeve or hub ofthe arm 58 extends a screw 77, the inner end of which'takes against thebushing 74, and locks the two together so that the bushing and arm mustturn as one. A second screw 7 8 also extends through the sleeve or hubof the arm 58 and'takes against the gib 7 5. This latter screw enablesthe gib to be forced Ainto intimate contact with the adjacent surface ofthe squared portion of the rocker-shaft 59 and also ing up wear.

I claim as my inventionl. The combination with the needle-bar,

provides for takmeans for actuating the same, means for adjusting thelength of stroke of the needle-bar, the cast-off, its rocker-shaft, andoperating connectionsintermediate thesaid cast-off and rocker-shaft, oflactuating means for the rockl er-shaft, and adjusting means to increasethe throw of the rocker-shaftrand quicken the timing of the cast-olii',substantially as described.

n 2. The combination with the cast-off, its

rocker-shaft, and operating connections intermediate the said parts, ofan arm on the said rocker-shaft, an actuating cam, a bar connected withthe said arm and acted upon by the said cam, and means to adjust theconnection d of the bar lengthwise of the arm and simultaneouslytherewith effect an angular adjustvment of the bar relatively to thecam, wherebythe timing of the cams action is quickened, substantially asdescribed. l

3. The combination with the camV 50 and side cam 64, of the lever 5lVformed with the yoke iitted't-o the exterior of ,the cam 50, the arm 58,the link 54 connecting said lever and arm, the rocker-shaft 59 connectedto the said arm so as to rotate therewith but to move endwise relativelythereto, -the lever 65 acted upon by cam 64 and moving rocker-shaft 59lengthwise,a spring acting in opposition to the cam 64, and athread-guide carried by the said rocker-shaft, substantially asdescribed.

4. The combination with the rocker-shaft 59-having a hole through it, ofthe cylindrical pin 69 adjustable in-the said hole, the clamping screw70, block 7l carried by the said pin and having a hole therethrough, thethreadguide having a cylindrical stem, adjustable in the hole of saidblock and the clamping screw 73, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

HEBERA o. PETER-s. f

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